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Finding the Fourth Proportional to 1,153.71, 1,728.26 and 690.18

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Solution

The fourth proportional to 1,153.71, 1,728.26 and 690.18 is: 1,033.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.71 : 1,728.26 = 690.18 : x
  2. Step 2: Convert to fraction form
    1,153.71/1,728.26 = 690.18/x
  3. Step 3: Cross multiply
    1,153.71x = 1,728.26 × 690.18
  4. Step 4: Simplify right side
    1,153.71x = 1,192,810.49
  5. Step 5: Solve for x
    x = 1,192,810.49/1,153.71
  6. Step 6: Final answer
    x = 1,033.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.